农业生物学；土壤生物学关于植物养分和与土壤条件相关的生长的研究，尤其是对判定如何增加农作物产量方法的研究。
The study of plant nutrition and growth as related to soil condition, especially to determine ways to increase crop yield .
植物N：P化学计量学特征能够较好地反映氮、磷养分的限制作用。
Plant N:P stoichiometry can effectively reflect the type of nitrogen or phosphorus limitation.
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